substitute medicinal zinc? Without compromising piglet health and - - PowerPoint PPT Presentation

Mette Olaf Nielsen, Gizaw Dabessa Satessa, & Rajan Dhakal Department of Veterinary and Animal Sciences mette.olaf.nielsen@sund.ku.dk

Without compromising piglet health and growth performance (pilot study)

Can feeding of prefermented rape seed and seaweed to weaners substitute medicinal zinc?

CPH pig seminar 30 January 2018

Background

• Use of medicinal zinc oxide in piglet diets must be phased out by 2020
• Creates a need to find alternative and effective strategies to promote gut

health of weaner piglets in the future

• Lactic acid producing bacteria are used as probiotic supplements to

promote gut health

• Results not always convincing
• It has been proposed that additional gut health benefits for weaner piglets may be

achieved if lactic acid bacteria are used to preferment certain feeds

• Macroalgae, particularly brown algae species, contain different bioactive

compounds, of which some appear to possess antimicrobial properties

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Hypotheses of this pilot study:

• Inclusion of lactobacillus prefermented rape seed cake in piglet diets from 10 days

before weaning until 91 days after weaning (33 kg liveweight):

• Can substitute 2500 ppm zinc in diarrhea prevention
• Without negative impact on feed intake and growth rate of pigs neither by 91 days of

age (exit from weaner unit; appr. 33 kg) nor when slaughtered

• The preventive effect on diarrhea is more pronounced if the supplement in addition to

prefermented rape seed cake also contains certain brown macroalgae species

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Design of the pilot experiment:

• Conducted at private, commercial farm in Poland (120 km from Lublin)
• 1350 sows (LY Danbred C22 line)
• 33.5 weaned piglets ((LY)x(DP)) per sow annually (weaning: 28 days)
• 440g/d average daily gain in weaner unit (exit weight: ~33 kg)
• Feeding trial with 9 different dietary treatment groups (TG; mash feed)
• Litters standardized to 14 piglets per sow; fixed from day 14 post-partum
• Differential feeding - start: 10 days before weaning (25.09.2017)
• end: at exit from weaner unit (at 91 days of age)
• Will be followed until slaughter (fixed date mid-March ~ 115 kg)
• No systemic or individual antibiotics treatment of experimental pigs
• Piglets needing treatment (condition deteriorated):

eliminated from the experiment (treatment elsewhere)

• D15 after weaning, 6 piglets/TG were slaughtered (blood, intestines)

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D4 after weaning (27.8oC) D7 before weaning

Dietary treatments

• 9 different treatment groups (TG; 1 pen per treatment, 50 piglets per pen):

TG1: No supplementation 0Zn (negative control) TG2: 2500 ppm zinc oxide 2500Zn (positive control) TG3: 8% of DM as prefermented rape seed: EP100i 8%EP100 TG4: 10% of DM as prefermented rape seed: EP100i 10%EP100 TG5: - As TG4 + 0.6 % of DM brown algae product: EP900 +0.6%BA TG6: - As TG4 + 1.0% of DM brown algae product: EP900 +1.0%BA TG7: 12% of DM as prefermented rape seed: EP100i 12%EP100 TG8: 15% of DM as prefermented rape seed: EP100i 15%EP100 TG9: 25% of DM as prefermented rape seed: EP100i 25%EP100

• Supplements were supplied by Fermentation Experts, Denmark, and mixed

into the standard pre-weaner and starter diets

• Statistical analyses: all models included TG, gender and their interactions,

start weight (linear and quadratic)

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Results: Growth performance around weaning* for individual piglets (<50 observations per TG)

Parameter 0Zn 2500Zn 8%EP100 10%EP100 12%EP100 15%EP100 25%EP100 10%EP100 10%EP100 +0.6%BA 10%EP100 1.0%BA BW age: D18 5.83 5.28 5.62 4.92 4.92 4.92 5.22 4.92 5.22 5.21 kg ± SEM ± 0.88 ± 0.78 ± 0.83 ± 0.87 ± 0.83 ± 0.91 ± 0.75 ± 0.87 ± 0.99 ± 1.11 10 days before weaning until weaning (18 to 28 days of age) (corrected for BW D18 = start weight) ADG, g* 144a 197bcd 174ab 180bc 198bcd 224d 225d 180bc 206bcd 214cd BW D28, kg 6.67a 7.22bcd 6.99abc 6.94ab 7.22bcd 7.48d 7.50d 6.94ab 7.29bcd 7.36cd From weaning until 14 days after weaning (28-41 days of age) (corrected for start weight) ADG, g* 108ab 98a 153b 103ab 148ab 99a 116ab 103ab 124ab 123ab BW D41, kg 7.78a 8.34ab 8.96bc 8.31ab 9.18c 8.80bc 9.01bc 8.31ab 8.91bc 8.96bc From 10 days before weaning until 14 days after weaning (18-41 days of age) (corrected for start weight) ADG, g* 110a 135ab 162bc 134ab 171c 154bc 164bc 134ab 159bc 162bc

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*ADG: Average Daily Weight Gain; BW: Body weight Piglets eliminated included until time of elimination; P<0.0001 (ADG;W -> D14: 0.0032) <0Zn and =2500Zn <2500Zn

Results: Growth performance around weaning* for individual piglets (<50 observations per TG)

Parameter 0Zn 2500Zn 8%EP100 10%EP100 12%EP100 15%EP100 25%EP100 10%EP100 10%EP100 +0.6%BA 10%EP100 1.0%BA BW d18 5.83 5.28 5.62 4.92 4.92 4.92 5.22 4.92 5.22 5.21 kg ± SEM ± 0.88 ± 0.78 ± 0.83 ± 0.87 ± 0.83 ± 0.91 ± 0.75 ± 0.87 ± 0.99 ± 1.11 10 days before weaning until weaning (18 to 28 days of age) (corrected for start weight) BW d28 kg 6.67a 7.22bcd 6.99abc 6.94ab 7.22bcd 7.48d 7.50d 6.94ab 7.29bcd 7.36cd ADG, g*** 144a 197bcd 174ab 180bc 198bcd 224d 225d 180bc 206bcd 214cd From weaning until 14 days after weaning (28-41 days of age) (corrected for start weight) BW d41 kg 7.78a 8.34ab 8.96bc 8.31ab 9.18c 8.80bc 9.01bc 8.31ab 8.91bc 8.96bc ADG, g 108ab 98a 153b 103ab 148ab 99a 116ab 103ab 124ab 123ab From weaning until 14 days after weaning (28-41 days of age) (corrected for start weight) ADG, g 110a 135ab 162bc 134ab 171c 154bc 164bc 134ab 159bc 162bc

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*Piglets eliminated included until time of elimination Treatment effect: P<0.0001 (ADG; W -> D14: 0.0032)

• EP100i increased ADG pre-weaning to the same extent (at least) than 2500Zn
• Pre-weaning ADG and weight at weaning increased with increasing EP100i up to 15% in DM
• Slight further increase in weaning weight with BA

Results: Feed Conversion Rate (kg feed/kg body weight gain) (pen level; 1 observation per TG; raw data)

Parameter: 0Zn 2500Zn 8%EP 10%EP 12%EP 15%EP 25%EP 10%EP +0.6%BA +1.0%BA Average daily weight gain after weaning (from average piglet weights at period start and end): D15-30 226 230 316 329 293 291 294 329 281 298 D31-64 625 633 594 651 558 647 612 651 540 599 Feed conversion rate after weaning (kg feed/kg liveweight gain): D1-14 2.10 2.30 1.55 1.80 1.55 1.77 1.72 1.80 1.60 1.73 D15-37 1.67 1.62 1.62 1.54 1.57 1.54 1.52 1.54 1.60 1.59 D38-65 1.55 1.45 1.64 1.56 1.56 1.53 1.56 1.56 1.61 1.58 Whole weaner unit period (D1-64): Exit D64 post-weaning 33.6 33.8 34.7 35.4 32.4 35.0 34.5 35.4 31.7 34.1 Daily weight gain 408 414 425 450 400 437 422 450 382 418 FCR 1.60 1.54 1.63 1.56 1.56 1.54 1.56 1.56 1.61 1.59

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Better than 2500Zn As good as 2500Zn

Results: Feed Conversion Rate (kg feed/kg body weight gain) (pen level; 1 observation per TG; raw data)

Parameter: 0Zn 2500Zn 8%EP 10%EP 12%EP 15%EP 25%EP 10%EP +0.6%BA +1.0%BA Average daily weight gain after weaning (from average piglet weights at period start and end): D15-30 226 230 316 329 293 291 294 329 281 298 D31-64 625 633 594 651 558 647 612 651 540 599 Feed conversion rate after weaning (kg feed/kg liveweight gain): D1-14 2.10 2.30 1.55 1.80 1.55 1.77 1.72 1.80 1.60 1.73 D15-37 1.67 1.62 1.62 1.54 1.57 1.54 1.52 1.54 1.60 1.59 D38-65 1.55 1.45 1.64 1.56 1.56 1.53 1.56 1.56 1.61 1.58 Whole weaner unit period (D1-64): Exit D64 post-weaning 33.6 33.8 34.7 35.4 32.4 35.0 34.5 35.4 31.7 34.1 Daily weight gain 408 414 425 450 400 437 422 450 382 418 FCR 1.60 1.54 1.63 1.56 1.56 1.54 1.56 1.56 1.61 1.59

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Better than 2500Zn As good as 2500Zn

Data from 1 pen only, but if anything – EP100i compared to 2500Zn:

• Increased weight at exit from weaner unit (91 days of age)~1 kg
• Increased ADG D1-37 after weaning ~ 55-100g/d
• Improved FCR in weaner unit:
• Overall from D1-37
• Same overall FCR from insertion to exit from weaner unit

No additional beneficial effect of BA

Results: Piglet diarrhea after weaning (pen level; 1 observation per TG)

• No. of diarrhea cases:

0Zn 2500Zn 8%EP 10%EP 12%EP 15%EP 25%EP 10%EP +0.6%BA +1.0%BA Until D14 6 1 4 2 2 4 2 D15-64 6 2 12 15 6 10 4 15 6 10 Duration per case (avg.) 1.41 1.0 1.83 1.55 1.33 2.08 1.33 1.55 1.69 1.77 Total diarrhea days 17 3 22 31 8 25 8 31 22 39 Piglets completing (%) 77 91 93 84 89 81 89 84 90 83

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EP100:

• Ensured piglet completion rates ~ 2500Zn
• Without preventing diarrhea symptoms
• Ie. diarrhea was less detrimental (survival, growth)
• Reduced intestinal damage and immune cell infiltration
• Feed induced osmotic diarrhea?

Results: Small intestinal villi height (6 slaughtered piglets D11 after weaning per TG)

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Villi height (µm)

EP100:

• Increased small intestinal villi height <35% (maximal effect: 10% EP100i in diet)
• Stimulated extensive folding of villi => ↑↑↑ increase in surface area
• Immune cell infiltration and enterocyte morphological changes absent
• Also in colon

% EP100 in diet DM

Results: Small intestinal villi height (6 slaughtered piglets D11 after weaning per TG)

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Villi height (µm)

2500Zn: No significant impact on villi height Did not prevent immune cell infiltration or enterocyte morphology changes BA: Counteracted the effect of EP100i on villi height But not on barrier function traits

Treatment group

Results: Small intestinal enterocyte height (6 slaughtered piglets D11 after weaning per TG)

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Enterocyte height (µm) % EP100 in diet DM

EP100i addition:

• Increased enterocyte height <20% (diminishing effect >8% in DM)
• Clear and intact brush border

(brush- border)

Results: Small intestinal enterocyte height (6 slaughtered piglets D11 after weaning per TG)

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Enterocyte height (µm)

b ab ab a a a a ab ab

2500Zn: No impact on enterocyte height Did not block immune cell infiltration in small and large intestinal tissues Some improvement in brush border integrity (compared to 0Zn) BA: Abolished effect of EP100i on enterocyte height (but not on brush border integrity)

Treatment group

Conclusion 1 – Effect of EP100i (prefermented rape seed)

• EP100i compared to 0Zn:
• Increased ADG (dose-response) from 10 days before weaning until exit from weaner unit

=> increased weaning and exit weights

• Stimulated villi and enterocyte development (maximum effects at 10 and 8% DM in diet)
• Improved small and large intestinal barrier function and small intestinal surface area
• Increased absorptive capacity and improved resistance to bacterial infections
• Reduced no. of lost and eliminated piglets without reducing diarrhea incidence
• Feed induced osmotic rather than pathogen induced diarrhea
• EP100i compared to 2500Zn:
• Higher ADG and FCR (D10 pre- to D30 post-weaning)

=> heavier piglets at weaning and exit

• Prevented mortality and need for antibiotics treatment to the same extent

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Conclusion 2 – Effect of brown algae (BA) product: EP900 (when added to 10% EP100i diet)

• Increased piglet weight at weaning
• Decreased ADG from D31-64 after weaning and hence exit weight
• Blocked stimulating effect of EP100i on villi length and enterocyte height
• But not the effect of EP100i on intestinal barrier function
• Beneficial in susceptible period pre-weaning?
• Antimicrobial effect?
• Complementing barrier function effect of EP100i?

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Acknowledgements

• Jens Legarth, Fermentation Experts, Denmark
• Robert Chachaj, FeedStar, Poland
• Farm staff at Chotycze farm, Łosice, Poland

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